Device for rigidly assemblying two elements of a jib of a public works machine

ABSTRACT

This invention relates to a device for rigidly assembling the two elements of a jib of a public works machine, in which the connection of the two elements is ensured by two means of articulating one element on the other. This device comprises two connecting rods, one end of each being articulated on the pre-boom. One application is the production of a jib of adjustable length. This device comprises two connecting rods, one end of each being articulated on the pre-boom. One application is the production of a jib of adjustable length.

United States Patent Jankowiak 1 Dec. 2, 1975 DEVICE FOR RIGIDLY ASSEMBLYING 3,148,789 9/1964 Gourjon 2.14/138 R TWO ELEMENTS OF A JI O A PUBLIC 3,358,859 12/1967 Przybylski. 214/138 R WORKS MACHINE 3.465.904 9/1969 Pensa 214/141 [75] Inventor: Christian S. ,lankowiak, Meaux, FOREIGN PATENTS OR APPLICATIONS Fra e 1,484,693 5/1969 Germany 214/141 [73] Assignee: SBOTIieteIiAntIJInyme: Poclain, Le Plessis Primary Examiner Robert J. Spar e 6v] rance Assistant E.raminerRoss Weaver [22] Filed: Nov. 11, 1974 Attorney, Agent, or Firm-Fitzpatrick, Cella. Harper Appl. No.: 522,909

[30] Foreign Application Priority Data Nov. 22, 1973 France 73.41664 [52] U.S. Cl 214/141; 212/144; 214/138 R [51] Int. Cl. E02F 3/38 [58] Field ofSearch ..214/138 R, 141;212/8 R, 212/54, 55, 70, I44

[56] References Cited UNITED STATES PATENTS 3,085,695 4/1963 Miller 212/144 & Scinto 57] ABSTRACT This invention relates to a device for rigidly assembling the two elements of a jib of a public works machine, in which the connection of the two elements is ensured by two means of articulating one element on the other.

This device comprises two connecting rods, one end of each being articulated on the pre-boom.

One application is the production of a jib of adjustable length.

5 Claims, 6 Drawing Figures Sheet 1 of 3 U8. Patent Dec. 2, 1975 US. Patent Dec. 2, 1975 Sheet 2 of3 3,923,172

US. Patent Dec. 2, 1975 Sheet 3 on 3,923,172

DEVICE FOR RIGIDLY ASSEMBLYING TWO ELEMENTS OF A .IIB OF A PUBLIC WORKS MACHINE This device comprises two connecting rods, one end of each being articulated on the pre-boom.

One application is the production of a jib of adjustable length.

The present invention relates to a device for rigidly assembling two elements of a jib of a public works machine.

A number of public works machines are provided with jibs carrying a work tool. Now, according to the nature of the work to be carried out, it has often appeared desirable to use a jib of adjustable length, although rigid in its working lay-out.

The invention proposes such an adjustable jib, which is of simple and inexpensive constitution.

To this end, the invention has for its object a device for rigidly assembling the two elements of a jib, of a public works machine, in which the two elements are connected by two means for articulating them to each other, this device comprising at least one first connection rod (or set of parallel connecting rods), articulated on each of the elements of the jib.

The device comprises a second connecting rod (or a second set of parallel connecting rods), also articulated on each of the elements of the jib, the first and second rods (or sets of rods) being articulated on one of the elements of the jib about the same axis.

One of the elements of the jib advantageously comprises an adjustable stop enabling the other element to be supported.

When the two elements are in assembled position, the stop is preferably disposed in the zone of the bearing face of the other element containing the perpendicular to this face passing through one of the articulations of said other element.

Finally, it is often desired that at least one of the elements comprises a plurality of articulation members intended to receive the members for assembling the end of a connecting rod, these articulation members preferably being disposed in a line.

The invention will be more readily understood on reading the following description with reference to the accompanying drawings, in which:

FIGS. la to 1d show elevations of four distinct layouts of an embodiment of a hydraulic shovel according to the invention;

FIG. 2 is a view in the direction of arrow G of FIG. 1b;

FIG. 3 shows in detail a variant embodiment of the shovel shown in FIGS. la to 1d.

Referring now to the drawings, the shovel shown in FIG. la comprises:

- a chassis 1a provided with endless tracks 2a,

- a turret 3a mounted to rotate about an axis 4a on chassis la,

- a pre-boom 5a articulated to the turret 3a about a horizontal axis 6a,

- a jib 7a connected to the pre-boom 50 by means which will be described hereinafter,

- a balance beam 8a articulated on the jib 7a about a horizontal axis 9a, parallel to axis 6a, and

- a bucket 10 a articulated on the balance beam 8a about an axis 11a also parallel to axis 6a.

Jacks 12a, and 13a and 14a are coupled between the turret 3a and the pre-boom 5a, between the jib 7a and balance beam 8a, and between the balance beam 8a and the bucket 10a, respectively, so as to allow, in manner known per se, the adjustment of the relative positions of these various elements. It should be noted that the bucket has been driven into the ground 15 and may be considered as being immobile with respect thereto.

As for as the constitution of jib 7a is concerned, it will be noted that this element comprises a plurality of holes 16a, 17a, 18a, 19a and 20a, which follow one another from the end of this jib opposite axis 9a and which are disposed in a straight line 21a substantially parallel to the axisof said jib. A pin 30a is mounted at the end of the pre-boom 5a opposite axis 6a. Four connecting rods, two connecting rods 31a and two connecting rods 32a, are articulated, by one of their ends, about this axis 30a, one connecting rod 31a and one connecting rod 32a on each side of the pre-boom 5a. The end of the pre-boom 5a is furthermore provided with two bearing faces 33a and 34a forming stops, on which the lower face 35a of the jib 7a may abut, substantially at right-angles to the perpendiculars 45 dropped by axes 16a and 17a respectively to said face 35a.

Finally, it will be noted that a pin 36a is introduced in the other end hole in connecting rods 31a and in the hole 16a of the jib 7a, whilst, in similar manner, a pin 37a is introduced into the other end hole in the connecting rods 32a and in the hole 17a of said jib 7a. By means of the triangular arrangement constituted by connecting rods 31a and 32a and by the distance between holes 16a-17a of the jib 7a, said jib is rendered fast with the pre-boom 5a.

The jib 5a and pre-boom 7a thus assembled constitute what is commonly known as the jib of the shovel which is consequently rigid but made of two parts.

All other arrangements of FIG. la remaining unchanged, the lay-out of FIG. lb differs from that of FIG. la in that the pin 36a has been taken out of the hole 16a, so that the connecting rods initially disposed in 31a are now only suspended from pin 30a, at 3112.

FIG. 10 shows a third lay-out which follows from FIG. 1b by advancing the chassis 1a to la, the bucket remaining driven in the ground 15 at 10a. The turret, preboom, jib and balance beam are now at 3c, 5c, 70 and 8c. The holes initially at 16a, 17a, 18a, 19a and 20a and the axis initially at 30a are now disposed at 16c, 17c, 18c, 19c and 200, and 30c respectively. The pin initially introduced at 37a into hole 17a of the jib is now at 37c in the hole 170. The connecting rods 31a and 32a have come to 310 and 320, connecting rods 310 still suspended from axis 30c and connecting rods 32c connecting axes 30c and 370.

Finally, all other dispositions of FIG. 1c remaining unchanged, the lay-out of FIG. 1d differs from that of FIG. 10 in that a pin 36d (constituted by pin 36a of FIG. la) is introduced both in the holes of jib 7c and in the end holes of connecting rods 31d (disposed at 310 in the lay-out of FIG. 1c).

A triangular, thus rigid assembly device is found, which is constituted by connecting rods 32c and 31d and by the distance between holes l7c-18c of the jib 7c. The dimensions of the rigid jib-preboom assembly have been modified and in fact reduced between the lay-out of FIG. la and that of FIG. Id.

In the present case, the range of the assembly, measured for example by the distance between axes 6a and 9a has been reduced to the distance between the new positions 6d and 9d of these axes.

By successively modifying the distance between axes l6a17a, l7a-l8a, l8a-l9a and l9a-20a, this modification of the geometry of the jib-preboom assembly may be chosen satisfactorily as a function of the work to be carried out.

FIG. 2 shows that each connecting rod is provided with a boss 38b which makes it possible to compensate for the thickness of the connecting rods 32a which are disposed on the side of the jib 7a and pre-boom a, said jibs and pre-booms being of equal width.

Finally, FIG. 3 shows a variant embodiment of the pre-boom 5a. One of the bearing faces 33a, 34a, in the present case the support face 34a, is fast with a piston 39a which is mounted to slide in a cylinder 40a fast with the structure of the pre-boom 5a. Furthermore, the cylinder 41a of a double-acting jack 42a is fixed to the structure of the pre-boom 5a by means of a flange 43a, whilst the piston rod 44a of the jack 42a is fast with the piston 39a. Furthermore, it is noted that the bearing faces 33a and 34a are convex and in fact practically cylindrical.

Finally, with the embodiment described with regard to FIGS. la to 1d, the connecting rods provided make it possible to modify the geometry of the rigidly assembled jib-preboom assembly without having to detach the jib entirely from the pre-boom, in order to effect the desired modification. At least one connecting rod permanently connects these two elements of FIGS. la

to 1d. Consequently the manoeuvre permitting the modification is very safe and simple to carry out.

Concerning the variant embodiment of FIG. 3, it may be added that the adjustment of the position of the face 34a by means of the double-acting jack 42a is interesting, since it makes it possible for this face effectively to act as position stop, which is desired. Naturally, the convex characteristic of the faces:33a and 34a ensures a support on a bearing face and not on a shaper edge.

What we claim is:

l. A device for rigidly assembling the two elements ofajib of a public works machine, in which the two elements are connected by two means of articulating them to each other, this device comprising at least one first connecting rod (or a set of parallel connecting rods), articulated on each of the elements of the jib, said device further comprising a second connecting rod (or a second set of parallel rods), also articulated on each of the elements of the jib, the first and second connecting rods (or set or rods) being articulated on one of the elements of the jib about the same axis.

2. A device as claimed in claim 1, wherein one of the elements of the jib comprises, in manner known per se, an adjustable stop enabling the other element to be supported.

3. A device as claimed in claim 2, wherein, in the assembled position of the two elements, the stop is disposed in the zone of the bearing face of the other element containing the perpendicular to this face passing through one of the articulations of said other element.

4. A device as claimed in claim 1, wherein, in manner known per se, at least one of the elements comprises a plurality of articulation members intended to receive the members for assembling the end of a connecting rod.

5. A device as claimed in claim 4, wherein, in manner known per se, the articulation members are disposed in a line.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 ,923, 172 Dated December 2, 1975 Inventor(s) CHRISTIAN S. JANKOWIAK It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, lines 4 to 7, delete "This device comprises a of adjustable length.

Column 2, line 34, change "jib 5a and pre-boom 7a" to jib 7a and pre-boom 5a Column 4, line 4, change "sharper" to sharp gigncd and Scaled this A ttes r:

RUTH C. MASON C. MARSHALL DANN Arresting Officer mmm'ssimu'r uj'Pulenrs and Trademarks 

1. A device for rigidly assembling the two elements of a jib of a public works machine, in which the two elements are connected by two means of articulating them to each other, this device comprising at least one first connecting rod (or a set of parallel connecting rods), articulated on each of the elements of the jib, said device further comprising a second connecting rod (or a second set of parallel rods), also articulated on each of the elements of the jib, the first and second connecting rods (or set or rods) being articulated on one of the elements of the jib about the same axis.
 2. A device as claimed in claim 1, wherein one of the elements of the jib comprises, in manner known per se, an adjustable stop enabling the other element to be supported.
 3. A device as claimed in claim 2, wherein, in the assembled position of the two elements, the stop is disposed in the zone of the bearing face of the other element containing the perpendicular to this face passing through one of the articulations of said other element.
 4. A device as claimed in claim 1, wherein, in manner known per se, at least one of the elements comprises a plurality of articulation members intended to receive the members for assembling the end of a connecting rod.
 5. A device as claimed in claim 4, wherein, in manner known per se, the articulation members are disposed in a line. 